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Odostomia pleioregona
''Odostomia pleioregona'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. 〔 (P. Bartsch (1917), Descriptions on new West American mollusks and notes on previously described forms, Proceedings of the United States National Museum, 52(2193): 637-681, 6 pls.. ) 〕
This extinct species dates from the Upper Pliocene in Oregon.
==Description==
The white shell has a broadly conic shape. Its length measures between 3.6 mm and 4.8 mm. The whorls of the protoconch are deeply immersed in the first of the succeeding turns, above which the tilted edge of the last volution only projects. The five whorls of the teleoconch are flattened, and appressed at the summit. All of themare marked by very fine, closely spaced, spiral striations and decidedly retractively slanting, fine incremental lines. The suture is moderately impressed. The periphery of the body whorl is inflated, and obtusely angulated. The base of the shell is short, and well rounded. The large aperture is slightly effused anteriorly. The posterior angle is acute. The outer lip is thin. The inner lip is oblique, slightly revolute, and appressed to the base for its posterior half . It is provided with a strong, oblique fold at its insertion. The parietal wall is covered with a thick callus. 〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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